MIAMI -- Ander Herrera has leapt to Jose Mourinho's defence by insisting the Manchester United manager's frustrations during a turbulent preseason are justified.
Mourinho has had to contend with post-World Cup holidays, a lengthening injury list and difficulties in the transfer market while on the five-game trip in the United States.
His squad has become so stretched that just five senior outfield players -- Alexis Sanchez, Juan Mata, Luke Shaw, Fred and Matteo Darmian -- were able to train at Barry University on Monday morning.
The Portuguese coach has cut a frustrated figure but Herrera insists he understands his manager's concerns.